|Publication number||US5233283 A|
|Application number||US 07/801,937|
|Publication date||Aug 3, 1993|
|Filing date||Dec 3, 1991|
|Priority date||Dec 4, 1991|
|Also published as||CA2056908A1, CA2056908C|
|Publication number||07801937, 801937, US 5233283 A, US 5233283A, US-A-5233283, US5233283 A, US5233283A|
|Original Assignee||John Kennedy|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (88), Classifications (10), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to light curing system and particularly relates to a light curing system for portable light curing devices used in dental applications.
Light cured composites have become materials of choice for a large number of dental restorations. These composites are easy to work with, contain no potentially dangerous metals, and are available in a large variety of shades to match the tooth enamel color of the patient. In use, the composite is first applied onto the area on the tooth of the patient and then it can be hardened or photo polymerized by exposing it to a high intensity light of wavelengths between 400 and 500 nanometers. Typically the high intensity light is provided by the light generated by a quartz halogen light source. The light is delivered to the composite at the patient's tooth by an elongated flexible light guide. Such elongated light guide often is awkward to manipulate and restricts the mobility of the dentist. In another curing light construction, the light lamp is incorporated in a hand-held unit which is connected by a power supply cord to a power supply for providing the electrical power for operating the light lamp. The elongated power supply cord in this case again restricts the mobility of the dentist.
Recently, attempts have been made to provide a battery powered portable hand-held light unit. The concept has been to free the dentist or assistant completely for better mobility when performing the light curing operation and to allow easy movement of the light from operatory to operatory. However, such portable curing units have been unsatisfactory, in that the curing light generated by the battery in the unit is not constant. Light cured composites used in dentistry vary in cure depths and speeds from manufacturer to manufacturer, from one shade of color to another and from one fill material to another. Cure times used by dentists as recommended by the composite manufacturers vary from ten seconds to one minute. If multiple restorations are being performed in a patient's mouth there can require up to 8 minutes or longer of light curing time. Undercuring is one of the major causes of restoration failures, and undercuring may lead to post operative sensitivity and/or marginal leakage which may lead to secondary carries. It is therefore an absolute necessity that a battery powered curing light unit should be capable of not only multiple exposures that may result in accumulations of up to 8 minutes or longer ON time, but the battery powered curing light unit must provide a consistent output that the dentist can count on. Only with a consistent light output in the wavelength range of between 400 and 500 nanometers can the dentist judge the curing time exposure required by the shade of the material being used in the restoration and the depth of the material being used in the restoration. In the known portable battery powered light curing device, the electrical power of the battery decreases rapidly with the length and number of ON time, and the intensity of the light output also proportionally decreases accordingly. Thus, the output light intensity is not consistent and is unreliable.
It is a principal object of the present invention to provide a system which can be incorporated in a portable light curing device to provide a consistent output light intensity.
It is another object of the present invention to provide a system which monitors the activation of curing light by a battery power source.
It is another object of the present invention to provide a portable light curing device which is reliable for multiple dental restoration purposes.
It is yet another object of the present invention to provide a portable light curing device which includes a fast rechargeable system for maintaining the device fully charged in a standby condition.
The electrical system according to the present invention is particularly useful in a portable battery operated light curing device. It comprises a light lamp operative to provide a light energy of a selected level. A battery power source is coupled to the light lamp and is operative to provide the electrical energy for activating the light lamp to generate the light energy. A microprocessor device is coupled to the light lamp and the battery power source and is operative to regulate and monitor the supply of the electrical power to the light lamp in the form of a series of electrical pulse signals.
FIG. 1 is a schematic block diagram showing the system of the present invention.
FIG. 2 is a graphical diagram showing the serial of electrical pulse signals supplied to the light lamp by the microprocessor device according to the present invention.
FIG. 3 is an electrical partial schematic and block diagram showing the charging system for the battery according to the present invention.
With reference to the drawings, the system according to the present invention which is suitable for incorporating in a portable light curing device is generally shown in FIG. 1. The system comprises a curing light lamp 10 such as a quartz lamp which can be activated by a battery power source 11 to provide a light energy output suitable for light curing purposes. The light energy is typically in the range of from 400 to 500 nanometers. The battery power source 11 may be a nickel cadmium rechargeable battery which can be maintained in a fully charged standby condition by a charging system. The light lamp 10 and the battery 11 are housed in a portable hand-held unit such that it is convenient for a dentist to use it for dental curing purposes. A microprocessor (MCU) device 12 is connected to the battery 11 and the gate terminal of a series pass semiconductor metal oxide semiconductor field effect transistor (MOSFET) 13 which is serially connected between the battery 11 and the light lamp 10. Whenever the system is activated by the operation of an ON/OFF switch 14, the light lamp 10 is energized by a series of controlled pulse voltage to provide a constant light energy output. The voltage applied to the lamp 10 is a series of pulse voltage as shown in FIG. 2 in which the ON time of the pulse voltage is T(on) and the OFF time is T(off). The MCU 12 controls the electrical power supplied to the lamp 10 by controlling the duty cycle i.e. the ratio of T(on) to T(off) of the applied voltage to the lamp 10. The MCU 12 controls this duty cycle according to the battery voltage by generating series of electrical pulse signals to turn the MOSFET 13 on and off. The battery voltage is applied to the lamp 10 when the series pass MOSFET 13 is turned on. The lamp 10 receives no voltage when the MOSFET 13 is turned off.
The OFF time in the applied battery voltage is maintained constant by the MCU 12, while the ON time varies relative to the battery voltage according to the following formula:
in which V(rms)lamp is the regulated lamp rms voltage which is the equivalent D.C. voltage of the applied pulsed lamp voltage;
V(batt) is the battery voltage;
T(on) is the ON time; and
T(off) is the OFF time.
The microprocessor device 12 includes an analog to digital converter therein which sends output pulses to switch the logic level MOSFET transistor 13 ON and OFF so as to maintain the root mean square (rms) lamp voltage level constant. Once the battery voltage has dropped to a level equal to the rms lamp voltage, the microprocessor device 12 drives the MOSFET transistor 13 to hard ON thereby applying the battery voltage directly to the light lamp 10. In this manner, a constant electrical power is provided to the lamp while the electrical power in the battery may vary with the condition of the battery. The microprocessor device 12 is designed to shut down the curing light lamp 10 if the battery voltage has dropped below a minimum set value. This automatic shut off feature allows the curing light lamp 10 to operate only with the regulated output power and to protect the battery from fully discharged. The microprocessor device 12 will also shut down the system when it detects a fault condition so as to protect the MOSFET transistor 13 and the light lamp 10 from damages.
The length of time the curing light lamp 10 is activated may be selected with a mode selector 15 connected to the microprocessor device 12. Accordingly, the ON time of the light lamp 10 can be set to the required curing time for the particular curing composite used as recommended by its manufacturer. The selected curing time is displayed in a digital display 16 connected to the microprocessor device 12. After a selected curing time is set by the mode selector 15, the display 16 will start to count down as soon as the curing light lamp 10 is activated until it counts to zero and time out. Also, the mode switch 15, when pre-set to zero can actuate the display 16 to show the selected length of curing time, and such selected time would be freezed when it is shut off. A beeper 17 coupled to the microprocessor device 12 will emit a short operating sound signal when the light lamp 10 is turned ON. A double action switch may be used for the ON/OFF switch 14 such that the light lamp 10 can be conveniently turned ON and OFF alternately by pressing the single ON/OFF switch. When the light lamp 10 is turned off, the beeper 17 will emit an extended sound signal to indicate that the system has been shut down. The microprocessor device 12 also controls the voltage supply to a ventilation fan 18 located adjacent to the light lamp 10. Whenever the lamp 10 is activated the ventilation fan 18 will be operated for a predetermined time interval so as to dissipate the heat inherently generated by the lamp 10. A temperature sensor 19 such as a thermistor is located close to the light lamp 10 and it is electrically connected to the microprocessor device 12. The temperature sensor 19 will also cause the system to shut down if the temperature of the lamp 10 exceeds a predetermined allowable limit. The control circuit in the microprocessor device 12 will automatically place the device in its lowest power consumption mode when it is not in use. The microprocessor device 12 also includes a monitor means therein which supervises the input of power from a charger 20 to the battery such that it would not allow the lamp 10 to be activated while the battery is being charged.
The charger 20 is connected to the battery 11 via protection diodes 21 and 22 which allow charges to flow in one direction from the charger to the battery and they prevent the charges from the battery to flow in the reverse direction back to the charger the charger connection terminals.
The charger 20 may be provided in a base on which the portable light unit is normally placed, when it is not in use. Associated terminals are provided in the light curing unit and the charger base such that they will engage one another when the light curing unit is placed onto the base unit so as to ensure that the battery 10 is recharged to its full power.
The unique charger 20 of the present invention can charge the battery 11 in a short period of time. Such short charge time enhances the charge efficiency and the battery capacity. Since nickel cadmium batteries cannot sustain indefinite overcharge at fast charge rates, the fast charger 20 is required to terminate the higher rate of charging before the battery receives too much overcharge. This charger 20 does not rely on arbitrary factors such as time to determine the optimum point to discontinue the high rate of charge. It continually monitors the battery voltage and detects the appropriate time to discontinue the high current flow to the battery by employing the voltage decrement cut off. The charger 20 detects a specific drop in the battery voltage from the highest potential it has reached and switches to a lower trickle charging rate.
The construction of the charger 20 is shown in the schematic diagram in FIG. 3. The charger 20 comprises a stepdown transformer 23 for reducing the common alternating current voltage to a lower secondary voltage. The low secondary voltage is then converted to a direct current voltage by a full wave rectifier bridge circuit 24. The charging of the battery 11 is controlled by a logic circuit 25 which is connected to the gate of a MOSFET transistor 26. The battery 11 is connected between the drain pin of the MOSFET transistor 26 and the positive side of the charging voltage from the rectifier bridge circuit 24. The control logic circuit 25 monitors and regulates the charging current by providing a gate drive voltage to the MOSFET transistor 26. The regulated current is set to a selected level typically about 550 milliamperes to charge the battery 10 in a relatively short time period of typically one hour. Once the logic circuit 25 has detected the battery 10 as fully charged, the current is switched to a low trickle rate and a light emitting diode 27 is actuated to indicate that the battery 10 :s fully charged. This trickle charge rate will not over-heat or stress the battery and it maintains the battery 10 in a fully charged state.
The logic circuit 25 also provides a short delay before current commences to flow from the charger 20 to the battery 11 after the connection of the battery is made, such delay eliminates arcing and contact wear with the formation of a rough contact surface commonly referred to as "pitting" at the battery connection terminals 28 and 29. The logic circuit 25 will cause the LED diode 27 to blink once to indicate the charger is in the ready state after a small time delay when the battery 11 is removed from the charger 20.
While I have illustrated in the drawings a specific system constituting the preferred embodiment of the invention, it will be appreciated that various modifications may be made in the sequence of steps of the method and in the form of the system, and that equivalent methods, elements and mechanisms may be substituted therefor without departing from the scope of the invention. All such changes, including reversals of parts and the use of certain features, all fall within the spirit and scope of the invention as defined in the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3659180 *||Jan 21, 1969||Apr 25, 1972||Andis Clipper Co||Self-charging appliance and stand|
|US3792341 *||Dec 22, 1971||Feb 12, 1974||Keithley Instruments||Power supply circuitry having base drive inhibit control|
|US4563629 *||Sep 13, 1983||Jan 7, 1986||Black & Decker Inc.||Battery recharging circuit with indicator means|
|US4639655 *||Apr 19, 1984||Jan 27, 1987||Westhaver Lawrence A||Method and apparatus for battery charging|
|US4670701 *||Nov 18, 1985||Jun 2, 1987||Matsushita Electric Industrial Co., Ltd.||Rechargeable cordless vacuum cleaner apparatus|
|US4714868 *||Oct 3, 1985||Dec 22, 1987||Sharp Kabushiki Kaisha||Charging and discharging control circuit for a storage battery|
|US4727306 *||Jun 26, 1986||Feb 23, 1988||Motorola, Inc.||Portable battery charger|
|US4803416 *||Aug 20, 1986||Feb 7, 1989||Jacques Abiven||Storage battery control device|
|US4806840 *||Dec 15, 1986||Feb 21, 1989||Alexander Manufacturing Company||Method and apparatus for charging a nickel-cadmium battery|
|US4847513 *||Feb 26, 1988||Jul 11, 1989||Black & Decker Inc.||Power-operated device with a cooling facility|
|US4998057 *||Jan 17, 1989||Mar 5, 1991||Hitachi Koki Co., Ltd.||Method and apparatus for charging a battery|
|US5065083 *||Aug 25, 1989||Nov 12, 1991||Staodyn, Inc.||Microprocessor controlled electronic stimulating device having a battery management system and method therefor|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5399956 *||Feb 3, 1992||Mar 21, 1995||Motorola, Inc.||Backup battery system for a portable electronic device|
|US5471129 *||Apr 2, 1993||Nov 28, 1995||Ivoclar Ag||Rechargeable light curing apparatus|
|US5634711 *||Sep 13, 1994||Jun 3, 1997||Kennedy; John||Portable light emitting apparatus with a semiconductor emitter array|
|US6015239 *||Apr 20, 1998||Jan 18, 2000||Cielo Communications, Inc.||Passively aligned opto-electronic coupling assembly|
|US6200134||Jan 20, 1998||Mar 13, 2001||Kerr Corporation||Apparatus and method for curing materials with radiation|
|US6314236 *||Jan 27, 2000||Nov 6, 2001||Conair Corporation||Cordless dryer safety interlock system|
|US6325791 *||Aug 16, 1999||Dec 4, 2001||Yutaka Shimoji||Method of using a cordless medical laser to cure composites|
|US6331111||Sep 24, 1999||Dec 18, 2001||Cao Group, Inc.||Curing light system useful for curing light activated composite materials|
|US6440122 *||Dec 30, 1999||Aug 27, 2002||Yutaka Shimoji||Method of using a cordless pumped μ-chip medical laser to cure composites|
|US6611110||Jul 17, 2001||Aug 26, 2003||Design Rite, Llc||Photopolymerization apparatus|
|US6692251||Aug 4, 2000||Feb 17, 2004||Kerr Corporation||Apparatus and method for curing materials with light radiation|
|US6692252||Dec 17, 2001||Feb 17, 2004||Ultradent Products, Inc.||Heat sink with geometric arrangement of LED surfaces|
|US6719558||Feb 11, 2002||Apr 13, 2004||Densen Cao||Curing light|
|US6719559||Feb 12, 2002||Apr 13, 2004||Densen Cao||Curing light|
|US6780010||Feb 5, 2002||Aug 24, 2004||Cao Group, Inc.||Curing light|
|US6783362||Dec 13, 2001||Aug 31, 2004||Cao Group, Inc.||Dental curing light using primary and secondary heat sink combination|
|US6908586||Oct 23, 2001||Jun 21, 2005||Fusion Uv Systems, Inc.||Free radical polymerization method having reduced premature termination, apparatus for performing the method and product formed thereby|
|US6910886||Feb 6, 2002||Jun 28, 2005||Cao Group, Inc.||Curing light|
|US6918762||Mar 21, 2003||Jul 19, 2005||Kerr Corporation||Light-generating instrument|
|US6926524||Feb 11, 2002||Aug 9, 2005||Cao Group, Inc.||Curing light|
|US6929472||Feb 5, 2002||Aug 16, 2005||Cao Group, Inc.||Curing light|
|US6932600||Feb 5, 2002||Aug 23, 2005||Cao Group, Inc.||Curing light|
|US6971875||Dec 13, 2001||Dec 6, 2005||Cao Group, Inc.||Dental curing light|
|US6974319||Feb 5, 2002||Dec 13, 2005||Cao Group, Inc.||Curing light|
|US6979193||Feb 5, 2002||Dec 27, 2005||Cao Group, Inc.||Curing light|
|US6981867||Feb 5, 2002||Jan 3, 2006||Cao Group, Inc.||Curing light|
|US6988890||Feb 6, 2002||Jan 24, 2006||Cao Group, Inc.||Curing light|
|US6988891||Feb 5, 2002||Jan 24, 2006||Cao Group, Inc.||Curing light|
|US7037460||Aug 31, 2004||May 2, 2006||Fusion Uv Systems, Inc.||Free radical polymerization method having reduced premature termination, apparatus for performing the method, and product formed thereby|
|US7066732||Feb 11, 2002||Jun 27, 2006||Cao Group, Inc.||Method for curing light-curable materials|
|US7066733||Sep 5, 2003||Jun 27, 2006||Kerr Corporation||Apparatus and method for curing materials with light radiation|
|US7077648||Feb 5, 2002||Jul 18, 2006||Cao Group, Inc.||Curing light|
|US7086858||Dec 13, 2001||Aug 8, 2006||Cao Group, Inc.||Semiconductor curing light system useful for curing light activated composite materials|
|US7094054||Dec 13, 2001||Aug 22, 2006||Cao Group, Inc.||Dental curing light|
|US7182597||Aug 8, 2002||Feb 27, 2007||Kerr Corporation||Curing light instrument|
|US7210930||Sep 5, 2003||May 1, 2007||Kerr Corporation||Apparatus and method for curing materials with radiation|
|US7294364||Feb 5, 2002||Nov 13, 2007||Cao Group, Inc.||Method for curing composite materials|
|US7320593||Mar 7, 2001||Jan 22, 2008||Tir Systems Ltd.||Light emitting diode light source for curing dental composites|
|US7345320||Nov 2, 2004||Mar 18, 2008||Dahm Jonathan S||Light emitting apparatus|
|US7407617||Jan 17, 2006||Aug 5, 2008||Fusion Uv Systems, Inc.||Free radical polymerization method having reduced premature termination, apparatus for performing the method, and product formed thereby|
|US7535184||May 23, 2005||May 19, 2009||Design Rite Llc||Photopolymerization apparatus|
|US7540634||May 13, 2005||Jun 2, 2009||Henkel Corporation||High power LED electro-optic assembly|
|US7645056||Sep 25, 1998||Jan 12, 2010||Koninklijke Philips Electronics N V||Optical irradiation device having LED and heat pipe|
|US7733056 *||Apr 21, 2004||Jun 8, 2010||3M Innovative Properties Company||Prevention of electro-chemical corrosion at charging contacts of a battery-powered handpiece and its charger device|
|US7834335||Oct 27, 2008||Nov 16, 2010||Verilux, Inc.||Hand held sterilization devices|
|US7989839||Mar 1, 2010||Aug 2, 2011||Koninklijke Philips Electronics, N.V.||Method and apparatus for using light emitting diodes|
|US8047686||Aug 31, 2007||Nov 1, 2011||Dahm Jonathan S||Multiple light-emitting element heat pipe assembly|
|US8096691||Nov 30, 2009||Jan 17, 2012||Koninklijke Philips Electronics N V||Optical irradiation device|
|US8105532||Oct 27, 2008||Jan 31, 2012||Verilux, Inc.||Mobile disinfectant device and methods|
|US8113830||May 27, 2005||Feb 14, 2012||Kerr Corporation||Curing light instrument|
|US8226887||Dec 21, 2011||Jul 24, 2012||Verilux, Inc.||Mobile disinfectant device and methods|
|US8231383||Feb 6, 2007||Jul 31, 2012||Kerr Corporation||Curing light instrument|
|US8330121||May 3, 2011||Dec 11, 2012||Verilux, Inc.||Dynamic display and control of UV source for sanitization in mobile devices|
|US8568140||Mar 23, 2007||Oct 29, 2013||Jozef Kovac||Apparatus and method for curing materials with radiation|
|US9066777||Apr 1, 2010||Jun 30, 2015||Kerr Corporation||Curing light device|
|US9072572||Jun 21, 2013||Jul 7, 2015||Kerr Corporation||Dental light device|
|US9572643||Oct 11, 2013||Feb 21, 2017||Kerr Corporation||Apparatus and method for curing materials with radiation|
|US20020163317 *||Feb 5, 2002||Nov 7, 2002||Densen Cao||Curing light|
|US20020167283 *||Feb 5, 2002||Nov 14, 2002||Densen Cao||Curing light|
|US20020168603 *||Dec 13, 2001||Nov 14, 2002||Cao Group, Inc.||Dental curing light|
|US20020177096 *||Feb 11, 2002||Nov 28, 2002||Densen Cao||Method for curing light-curable materials|
|US20020181947 *||Feb 5, 2002||Dec 5, 2002||Densen Cao||Method for curing composite materials|
|US20020182561 *||Feb 5, 2002||Dec 5, 2002||Densen Cao||Curing light|
|US20030151376 *||Feb 5, 2002||Aug 14, 2003||Densen Cao||Curing light|
|US20040043351 *||Sep 5, 2003||Mar 4, 2004||Kerr Corporation||Apparatus and method for curing materials with radiation|
|US20040185413 *||Mar 21, 2003||Sep 23, 2004||Kerr Corporation||Light-generating instrument|
|US20040257037 *||Apr 21, 2004||Dec 23, 2004||Hartung Martin G.||Prevention of electro-chemical corrosion at charging contacts of a battery-powered handpiece and its charger device|
|US20050003322 *||Sep 5, 2003||Jan 6, 2005||Kerr Corporation||Apparatus and method for curing materials with light radiation|
|US20050032926 *||Aug 31, 2004||Feb 10, 2005||Okamitsu Jeffrey K.||Free radical polymerization method having reduced premature termination, apparatus for performing the method, and product formed thereby|
|US20050196720 *||Feb 18, 2005||Sep 8, 2005||Tir Systems Ltd.||Light emitting diode light source for curing dental composites|
|US20060116436 *||Jan 17, 2006||Jun 1, 2006||Fusion Uv Systems, Inc.|
|US20060269897 *||May 27, 2005||Nov 30, 2006||Gill Owen J||Curing light instrument|
|US20060287696 *||Jun 21, 2005||Dec 21, 2006||Wright David W||Heat and light therapy treatment device and method|
|US20070128577 *||Dec 5, 2005||Jun 7, 2007||Ultradent Products, Inc.||Dental curing lights including a capacitor power source|
|US20070134616 *||Feb 6, 2007||Jun 14, 2007||Owen Gill||Curing Light Instrument|
|US20080205062 *||Aug 31, 2007||Aug 28, 2008||Dahm Jonathan S||Multiple light-emitting element heat pipe assembly|
|US20100013649 *||Jul 21, 2009||Jan 21, 2010||Spira Joel S||Load control device having audible feedback|
|US20100073957 *||Nov 30, 2009||Mar 25, 2010||Koninklijke Philips Electronics N V||Optical irradiation device|
|US20100102252 *||Oct 27, 2008||Apr 29, 2010||Nicholas Harmon||Hand held sterilization devices|
|US20100104471 *||Oct 27, 2008||Apr 29, 2010||Nicholas Harmon||Mobile disinfectant device and methods|
|US20100121419 *||Nov 13, 2009||May 13, 2010||Ryan Douglas||Control of light sources for light therapies|
|US20100219736 *||Mar 1, 2010||Sep 2, 2010||Dahm Jonathan S||Method and apparatus for using light emitting diodes|
|EP0750889A1 *||Jun 28, 1996||Jan 2, 1997||CASTELLINI S.p.A.||A control device for polymerising lamps|
|EP0993810A3 *||Oct 11, 1999||Jun 27, 2001||CASTELLINI S.p.A.||A polymerising lamp control unit|
|EP1473795A1 *||Apr 29, 2003||Nov 3, 2004||3M Espe AG||Prevention of electro-chemical corrosion at charging contacts of a battery-powered handpiece and its charger device|
|WO1995007731A1 *||Sep 12, 1994||Mar 23, 1995||Efos Canada Inc.||A portable light emitting apparatus with a semiconductor emitter array|
|WO2002069839A1 *||Mar 4, 2002||Sep 12, 2002||Design Rite, Llc||Photopolymerization apparatus|
|WO2003002615A1 *||May 29, 2002||Jan 9, 2003||Fusion Uv Systems, Inc.|
|U.S. Classification||320/115, 320/134, 320/136|
|International Classification||H05B39/04, A61C13/15|
|Cooperative Classification||Y02B20/144, H05B39/047, A61C19/004|
|European Classification||H05B39/04B4M, A61C19/00D1|
|Jan 24, 1997||FPAY||Fee payment|
Year of fee payment: 4
|Jan 26, 1998||AS||Assignment|
Owner name: EFOS CANADA INC., CANADA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KENNEDY, JOHN;REEL/FRAME:008989/0312
Effective date: 19970811
|Jan 31, 2001||FPAY||Fee payment|
Year of fee payment: 8
|Feb 3, 2005||FPAY||Fee payment|
Year of fee payment: 12
|Oct 29, 2010||AS||Assignment|
Owner name: LUMEN DYNAMICS GROUP INC., CANADA
Effective date: 20101001
Free format text: CHANGE OF NAME;ASSIGNOR:LUMEN DYNAMICS GROUP INC.;REEL/FRAME:025204/0952